On the car I have now... The AC had been upgraded at some point so I figured why not keep it. After turning it on it would engage but wouldn't cool, so I figured it might need a recharge. I bought some of that environmentally safe shit for like 35 - 40$... So as I'm filling it up all I hear is it pissing out from some line someplace....

Okay I just wasted 40$...

I ripped the bloody thing out of there and never looked back. Gets in the way when doing things like timing belts anyways... (or water pumps at -25c - the definition of pain) Radiator gets more air, leaves room for the future... a small inter-cooler or whatever.